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and GuidesOutside link
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PASSWORD CHEATS

HOW TO ENTER THE
PASSWORDSFollow the steps below...1. In One Player Mode, during play,press ' to
open the chat window.
2. Enter one of the codes below.
3. Press enter to close the window and activate the cheat of your
choice..

Some of these
cheats, if not all, also work on the add-on mission packs, but some
require you to press Enter instead of ' to open the chat
window..